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Reference.org
CERN SGML
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<p>CERN SGML, also known as "Waterloo based SGML", "Waterloo SGML", and "SGMLguid", was an early <a href="/facts/Standard_Generalized_Markup_Language/euIKXwHV">SGML</a> application developed and used at <a href="/facts/CERN/y1gwRchm">CERN</a> between 1986 and 1990. It served as a model of the earliest <a href="/facts/HTML/sSc3fT78">HTML</a> specifications. </p>